PE-538 Human Autologous Bone Marrow-derived Cell Transplantation(BMCT) Combined with Off-pump Coronary Bypass Surgery(OPCAB), Assessment of Feasibility, Mechanisms and Histopathological Findings(Regeneration (angionenesis/myocardial regeneration)-4 (M) PE90,Poster Session (English),The 70th Anniversary Annual Scientific Meeting of the Japanese Circulation Society)